I wouldn't think it is due to that new mod install. The export module simply takes the information already entered into the DB with each order and pulls it for export. Install of new mods (unless the specifically alter order fields in the db) should have little or no effect.
What happens if you select the "include orders already downloaded in export" and also add a date range to the export? Does it pull all orders then or still just a few?
Thanks for the feedback here.
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